Reciprocal Space Maps

Reciprocal Lattice Point (RLP) shapes depend on sample dimensions and perfection. Interpretation of broadening:

Along w/2q direction

variation in d-spacing with depth for thick layers

peak broadening due to thin layers

wavelength broadening of incident beam (not monochromatic)

Along w direction

mosaic spread or lateral incoherence

high uniform dislocation density

sample curvature

Along 2q direction

detector aperture